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Recently, Abdalla et al. proposed a new gateway-oriented password-basedauthenticated key exchange (GPAKE) protocol among a client, a gateway, and anauthentication server, where each client shares a human-memorable password witha trusted server so that they can resort to the server for authentication whenwant to establish a shared session key with the gateway. In the letter, we showthat a malicious client of GPAKE is still able to gain information of passwordby performing an undetectable on-line password guessing attack and can notprovide the implicit key confirmation. At last, we present a countermeasure toagainst the attack.

Weakness Analysis and Improvement of a Gateway-Oriented Password-Based Authenticated Key Exchange Protocol